To be forthright, I should warn that these versions are my perverted, setting-specific ones . . . if you follow this story, you may find them (and other legendary materials) deviating rather radically from the according-to-Hoyle materials!

The Forge of Su is one of many potent "artifacts of Su" in my setting. Su was a mythological figure, a demon-slaying demigod. The Forge is a workshop that folds up into a small pack yet unpacks to a complete set of tools, a hot furnace, and so on, all of the highest quality. Su used it to repair his powerful demon-slaying weapons in the field, but Kaeso uses it to do mad science.

And yes, Kaeso is an alchemist and a Quick Gadgeteer. He's more than that, too -- artificer, engineer, master of weird science, etc.